While ARA membership is open to all cavers in Arizona, many belong to NSS Grottos which are local chapters of the NSS. The latest 'official' information for Arizona NSS Grottos is located at the NSS website listing​Arizona Grottos with known websites:​​Central Arizona GrottoEscabrosa GrottoSouthern Arizona Grotto​Arizona Grottos without known websites:Cochise County CaversMule Mountain Caving ClubNorthern Arizona Grotto​